Heart of the Dark Void

Indestructible
If Heart of the Dark Void would be removed from the game put it on the bottom of it owners library instead.
As long as your devotion to blue is greater than
six, you may cast cards you own from exile.
As long as your devotion to black is greater than
six, all creatures and players lose hexproof and
shroud and may not gain them.
If your devotion to blue and black is exactly 13, you win the game.